python – 多个WindowsBaloonTip / TrayTip通知？

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如果您使用下面的代码在通知区域中创建TrayTips(BaloonTips),您会注意到它只允许一条消息,然后卡住并出错.

代码取自here：

# -- coding: utf-8 --

from win32api import *
from win32gui import *
import win32con
import sys, os
import struct
import time

class WindowsBalloonTip:
    def __init__(self, title, msg):
        message_map = {
                win32con.WM_DESTROY: self.OnDestroy,
        }
        # Register the Window class.
        wc = WNDCLASS()
        hinst = wc.hInstance = GetModuleHandle(None)
        wc.lpszClassName = "PythonTaskbar"
        wc.lpfnWndProc = message_map # could also specify a wndproc.
        classAtom = RegisterClass(wc)
        # Create the Window.
        style = win32con.WS_OVERLAPPED | win32con.WS_SYSMENU
        self.hwnd = CreateWindow( classAtom, "Taskbar", style, \
                0, 0, win32con.CW_USEDEFAULT, win32con.CW_USEDEFAULT, \
                0, 0, hinst, None)
        UpdateWindow(self.hwnd)
        iconPathName = os.path.abspath(os.path.join( sys.path[0], "balloontip.ico" ))
        icon_flags = win32con.LR_LOADFROMFILE | win32con.LR_DEFAULTSIZE
        try:
           hicon = LoadImage(hinst, iconPathName, \
                    win32con.IMAGE_ICON, 0, 0, icon_flags)
        except:
          hicon = LoadIcon(0, win32con.IDI_APPLICATION)
        flags = NIF_ICON | NIF_MESSAGE | NIF_TIP
        nid = (self.hwnd, 0, flags, win32con.WM_USER+20, hicon, "tooltip")
        Shell_NotifyIcon(NIM_ADD, nid)
        Shell_NotifyIcon(NIM_MODIFY, \
                         (self.hwnd, 0, NIF_INFO, win32con.WM_USER+20,\
                          hicon, "Balloon  tooltip",msg,200,title))
        # self.show_balloon(title, msg)
        time.sleep(10)
        DestroyWindow(self.hwnd)
    def OnDestroy(self, hwnd, msg, wparam, lparam):
        nid = (self.hwnd, 0)
        Shell_NotifyIcon(NIM_DELETE, nid)
        PostQuitMessage(0) # Terminate the app.

def balloon_tip(title, msg):
    w=WindowsBalloonTip(title, msg)

解决方法:

正如您所看到的,如果您尝试将多个balloon_tip发送到WindowsBalloonTip类,您将收到以下错误：

File "C:/WindowsBalloonTip.py", line 20, in __init__
    classAtom = RegisterClass(wc)
error: (1410, 'RegisterClass', 'Class already exists.')

查看Microsoft的RegisterClass文档,您还需要使用UnregisterClass(lpClassName,hInstance)取消注册该类.

http://msdn.microsoft.com/en-us/library/ms644899

我们可以通过添加：classAtom = UnregisterClass(classAtom,hinst)来实现这一点,但必须在窗口被销毁之后添加它,例如这里是一个固定的完整版本

# -- coding: utf-8 --

from win32api import *
from win32gui import *
import win32con
import sys, os
import struct
import time

# Class
class WindowsBalloonTip:
    def __init__(self, title, msg):
        message_map = { win32con.WM_DESTROY: self.OnDestroy,}

        # Register the window class.
        wc = WNDCLASS()
        hinst = wc.hInstance = GetModuleHandle(None)
        wc.lpszClassName = 'PythonTaskbar'
        wc.lpfnWndProc = message_map # could also specify a wndproc.
        classAtom = RegisterClass(wc)

        # Create the window.
        style = win32con.WS_OVERLAPPED | win32con.WS_SYSMENU
        self.hwnd = CreateWindow(classAtom, "Taskbar", style, 0, 0, win32con.CW_USEDEFAULT, win32con.CW_USEDEFAULT, 0, 0, hinst, None)
        UpdateWindow(self.hwnd)

        # Icons managment
        iconPathName = os.path.abspath(os.path.join( sys.path[0], 'balloontip.ico' ))
        icon_flags = win32con.LR_LOADFROMFILE | win32con.LR_DEFAULTSIZE
        try:
            hicon = LoadImage(hinst, iconPathName, win32con.IMAGE_ICON, 0, 0, icon_flags)
        except:
            hicon = LoadIcon(0, win32con.IDI_APPLICATION)
        flags = NIF_ICON | NIF_MESSAGE | NIF_TIP
        nid = (self.hwnd, 0, flags, win32con.WM_USER+20, hicon, 'Tooltip')

        # Notify
        Shell_NotifyIcon(NIM_ADD, nid)
        Shell_NotifyIcon(NIM_MODIFY, (self.hwnd, 0, NIF_INFO, win32con.WM_USER+20, hicon, 'Balloon Tooltip', msg, 200, title))
        # self.show_balloon(title, msg)
        time.sleep(5)

        # Destroy
        DestroyWindow(self.hwnd)
        classAtom = UnregisterClass(classAtom, hinst)
    def OnDestroy(self, hwnd, msg, wparam, lparam):
        nid = (self.hwnd, 0)
        Shell_NotifyIcon(NIM_DELETE, nid)
        PostQuitMessage(0) # Terminate the app.

# Function
def balloon_tip(title, msg):
    w=WindowsBalloonTip(title, msg)

# Main
if __name__ == '__main__':
    # Example
    balloon_tip('Lorem Ipsum', 'Neque porro quisquam est qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit...')
    balloon_tip('Example two', 'There is no one who loves pain itself, who seeks after it and wants to have it, simply because it is pain...')

在加载图标的某些操作系统上存在问题,因此如果您需要自己的自定义图标,请更改此行：

iconPathName = os.path.abspath(os.path.join( sys.path[0], 'balloontip.ico' ))

对于这样的事情：

iconPathName = "C:\myfolder\myicon.ico"

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